Flasher outputs; Built-in AM/FM Tuner Stores 20 Preset Stations; Paging Input Accommodates Voice Announcements From A Telephone And/or Doorbell Tones From The Optional Niles DBI-1 Interface; System Architecture Allows Expansion To Eight Zones Via An Additional ZR-4 MultiZone Receiver; Party Mode: With a single press and hold from a keypad the user can turn on the entire house (or a preset number of zones) to listen to the same source.